SMC Networks 7908A-ISP, User Manual

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The following items are included on the information screen:
Parameter Description
Status
Line Status Shows the current status of the ADSL line connection.
Data Rate
Upstream Maximum upstream data rate.
Downstream Maximum downstream data rate.
Operation Data/Defect Indication
Noise Margin Maximum upstream and downstream noise margin.
Output Power Maximum fluctuation in the output power.
Attenuation Maximum reduction in the strength of the upstream and
downstream signal.
Fast Path FEC
Correction
There are two latency paths that may be used: fast and
interleaved. For either path, a forward error correction
(FEC) scheme is employed to ensure higher data integrity.
For maximum noise immunity, an interleaver may be used
to supplement FEC.
Interleaved Path
FEC Correction
An interleaver is basically a buffer used to introduce a
delay, allowing for additional error correction techniques
to handle noise. Interleaving slows the data flow and may
not be optimal for real-time signals such as video
transmission.
Fast Path CRC Error The number of Fast Path Cyclic Redundancy Check
errors.
Interleaved Path
CRC Error
The number of Interleaved Path Cyclic Redundancy
Check errors.
Loss of Signal
Defect
Momentary signal discontinuities.
Loss of Frame
Defect
Failures due to loss of frames.
Loss of Power
Defect
Failures due to loss of power.
Fast Path HEC
Error
Fast Path Header Error Concealment errors.